Keyboard shortcuts are among the best productivity hacks, and Adobe's design programs offer…
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The keyboard shortcuts cover everything from switching tools to working with layers and navigating the program. Some of the most useful ones include repeat last filter (Ctrl + F), go to the Crop and Resize tool (Shift + C), and Save image as (Shift + Ctrl + S). Of course, that depends on your workflow, but any way you slice it, this is a handy resource for GIMP users. Jeff Kayser created it for Gimp 2.6, but the shortcuts seem to still be the same for the latest version of Gimp (2.8).